April 2025 - R1chae

NOAA-2 zombie satellite hunting

April 30, 2025April 30, 2025

Noaa-2 aka ITOS-D is a very old decommissioned Satellite launched in 1972. Almost 50 years after launch it was discovered that it was still transmitting a modulated signal! So I waited for a nice pass, took my helicone antenna and recorded the pass. The satellite transmits at 1697.5 MHz and

Wavelength dependent Birefringence (or something)

April 29, 2025May 2, 2025

R1chae

Yes, I did the thing from the Posy video. TLDR; he uses a polarizing filter and some clear plastic to selectively color only polarized light. By putting some cheap plastic in front of the filter, the polarization of some wavelengths changes. The polarizing filter then filters away those wavelengths. And